Greg
18-Feb-2017, 16:47
Over the past year or two came across 2 brass lenses FS. Both had very poor descriptions but they were priced so low that I just couldn't pass them up. Well turns out that both are classic Petzval optics.
The one for 4x5 is a barrel Darlot with a professionally made set of Waterhouse stops. Intend on using it on my Sinar Norma with it's Copal shutter.
The one for Whole Plate has a working studio shutter. Also an iris with a marked f-stop ring. Iris works great wide open and closed down by one or 2 stops but then it becomes anything but circular... more like a crude off center oval. I have a 10X ND filter which makes using this optic in bright sunlight no problem using its studio shutter.
Simple question.... How often does one use a Petzval lens stopped down? Is it worth getting the iris on one of the lenses fixed to close down to circular small apertures? To me seems that stopping down a Petzval optic to f/45 or f/64 negates is Bokeh, but I may be totally wrong on that till I have a chance to shoot some test exposures with the two lenses.
Intensions for using both lenses are shooting outdoor subject matter at 6 to 12 feet away. No portraits. Just have to wait till the snow's gone.
The one for 4x5 is a barrel Darlot with a professionally made set of Waterhouse stops. Intend on using it on my Sinar Norma with it's Copal shutter.
The one for Whole Plate has a working studio shutter. Also an iris with a marked f-stop ring. Iris works great wide open and closed down by one or 2 stops but then it becomes anything but circular... more like a crude off center oval. I have a 10X ND filter which makes using this optic in bright sunlight no problem using its studio shutter.
Simple question.... How often does one use a Petzval lens stopped down? Is it worth getting the iris on one of the lenses fixed to close down to circular small apertures? To me seems that stopping down a Petzval optic to f/45 or f/64 negates is Bokeh, but I may be totally wrong on that till I have a chance to shoot some test exposures with the two lenses.
Intensions for using both lenses are shooting outdoor subject matter at 6 to 12 feet away. No portraits. Just have to wait till the snow's gone.